What causes the Nissan Sylphy's fan to keep running and the engine failing to start?
3 Answers
Nissan Sylphy's fan keeps running and the engine fails to start, which could be caused by reasons such as poor-quality gasoline, oxygen sensor failure, or spark plug carbon buildup. Poor-quality gasoline: Refueling with low-quality gasoline at non-standard gas stations can lead to incomplete combustion of the air-fuel mixture during engine operation, causing the engine warning light to illuminate. This does not affect driving safety but may harm the engine to some extent. Oxygen sensor failure: If the oxygen sensor is damaged or the sensor connector is damaged or loose, it can result in an overly lean or rich air-fuel mixture, triggering the warning light. Spark plug carbon buildup: Carbon buildup on spark plugs can cause poor engine performance, leading to issues such as difficulty starting, unstable idling, poor acceleration, backfiring during rapid acceleration, excessive exhaust emissions, and increased fuel consumption.
I've noticed that it's quite common for the Nissan Sylphy to have the fan running continuously but fail to start. The most frequent cause is a stuck cooling fan relay, where the fan keeps running and drains the battery, leading to insufficient power to start the engine. It could also be due to a faulty temperature sensor, which misinterprets high temperatures and keeps the fan running. Alternatively, issues with the starter or ignition system, such as failed spark plugs or coils, can cause this problem. When encountering this, I first check the battery voltage; if it's below 12V, it needs charging or replacement. If the fan is still running, I try locating the fuse box and removing the fan relay. Don't underestimate this issue—neglecting it long-term can lead to battery failure and increased costs. Regular checks of the fan system can prevent problems. For example, open the hood monthly to inspect wiring connections and prevent dust buildup from affecting heat dissipation.
I've been driving a Nissan Sylphy for several years. Once, I encountered a situation where the fan was buzzing loudly but the car refused to start, which was really frustrating. The reason was that the temperature sensor in my car was faulty, causing the fan to mistakenly think the engine was overheating and keep running, which drained the battery within a few hours. Later, I learned a trick: immediately turn off the ignition to avoid further power consumption; use a mobile app to check the battery voltage and confirm its status. If it's low, temporarily borrow a power bank to jump-start the car and go for repairs, otherwise contact a repair shop. In the end, replacing the sensor solved the problem at a low cost. I remind everyone not to delay, otherwise, if the starter breaks, the repair will be more expensive. When washing the car, take the opportunity to clean the components in the engine compartment to reduce the failure rate.
